Combination clutch-brake

ABSTRACT

A combination clutch-brake which includes a clutch unit including a clutch housing, a first hub, an annular clutch piston slidably mounted on said hub, an annular clutch cylinder carried by said clutch housing, a friction disc having fins thereon slidably mounted on and rotatable with the first hub, a brake unit including a disc journal having air passageways extending radially therein and mounted on a second hub, means rotatably mounting said second hub axially on said first hub, spring means normally urging said friction disc out of engagement with said disc journal, a brake housing mounted on said second hub, means connecting said clutch housing with said brake housing said brake housing having an annular cylinder formed therein, an annular piston base having an annular brake piston thereon and slidable within the annular cylinder, the brake piston having a friction facing thereon in axial alignment with the disc journal, means for normally urging the annular brake piston with said friction facing thereon out of engagement with said disc journal, means for causing fluid pressure to urge said clutch piston against said friction disc to cause said second hub to rotate, means for causing fluid pressure to urge said brake piston against said disc journal to brake the second hub, the friction disc formed with air passageways extending therethrough, the disc journal formed with air passageways extending therethrough and communicating with said air passageways of said friction disc, the brake piston base formed with air passageways extending therethrough and communicating with said air passageways of said disc journal, and the means connecting said clutch housing with said brake housing being separable.

United States Patent Hanks June 6, 1972 COMBINATION CLUTCH-BRAKEslidably mounted on said hub, an annular clutch cylinder carried b saidclutch housin a friction disc havin fins thereon [72] Inventor' JamesHanks Mmneapohs slidabi y mounted on and fotatable with the first hub, abrake [73] Assignee: Horton Manufacturing Company, Inc., unit includinga disc journal having air passageways extending Minneapolis, Minn.radially therein and mounted on a second hub, means rotatably mountingsaid second hub axially on said first hub,

[22] Flled: 1970 spring means normally urging said friction disc out ofengage- [21] APPL NOJ 19,883 ment with said disc journal, a brakehousing mounted on said second hub, means connecting said clutch housingwith said brake housing said brake housing having an annular cylinder[52] US. Cl. .,192/18.1, 192/12 B, 192/1 13 A f d therein, an annujarpiston base having an annular [51] Int. Cl ..F16d 67/02 brake pistonthereon and slidable within the annular cylinder. [58] Field of Search"192/18 A, 12 B, l 13 A the brake piston having a f i ti f i thereon iaxial alignment with the disc journal, means for normally urging the an-References Cited nular brake piston with said friction facing thereonout of engagement with said disc journal, means for causing fluid pres-UNITED STATES PATENTS sure to urge said clutch piston against saidfriction disc to 2,584,190 2 1952 Danly et al ..192 113 A cause Saidsecond hub to rotate, means for causing fluid p 3 1572 57 1 H1964 R00 n192/1 8 B sure to urge said brake piston against said disc journal tobrake 3,468,402 9/1969 Edwards .192/113 A the Second hub, thefrictiondisc formed with air passageways Primary Examiner-Benjamin W. WycheAssistant ExaminerRandall l-leald Anorney-Wicks and Nemer [5 7] ABSTRACTA combination clutch-brake which includes a clutch unit including aclutch housing, a first hub, an annular clutch piston extendingtherethrough, the disc journal formed with air passageways extendingtherethrough and communicating with said air passageways of saidfriction disc, the brake piston base formed with air passagewaysextending therethrough and communicating with said air passageways ofsaid disc journal, and the means connecting said clutch housing withsaid brake housing being separable.

7 Claims, 14 Drawing Figures PATENTEDJUH 61972 3, 667, 581

4 rrom/sys PATENTEUJUN 6 m2 SHEET 5 SF 5 w/v zmem/ COMBINATIONCLUTCH-BRAKE SUMMARY OF THE INVENTION The invention relates to animprovement in a combination clutch-brake which is mounted on a primemover such as an electrical motor and which is used to clutch in oralternately brake a gear reducer for example, connected to the brakeunit of the device. With the construction disclosed the brake unit maybe easily separated from the clutch unit and the brake unit or moduleused separately. Alternately the operative portions'of the brake unitmay be removed and the clutch unit module used separately. Thecombination clutch-brake includes a construction whereby the brake iscooled both in an operating condition or in an inoperative condition bythe rotation of the clutching unit friction disc.

Briefly, the device includes a finned driven friction disc clutchingmember engageable with a disc journal fixedly connected to a hub forrotation of the hub and a braking member which is engageable with thedisc journal for braking the hub. The friction disc is driven androtatably mounted in a clutch housing, and the disc journal and thebraking member are mounted in a brake housing removably attached to theclutch housing. The clutch housing is formed with air passageways as isthe disc journal and the passageways communicate. The brake housing isformed with air passageways as is the brake body. Rotation of thefriction disc causes a first flow of air into and out of the airpassageways of the clutch housing and friction disc which draws a secondflow of air inwardly through the air passageways of the disc journal andalso draws a third flow of air inwardly through the air passageways ofthe brake housing and brake body, the second and third air flows joiningthe first air flow for exodus out of the clutch housing thereby coolingthe brake unit when the disc journal and hub thereon is braked or in afree static condition. Alternatively, when the friction disc is inengagement with the disc journal and rotating the same, air is drawnradially inwardly through the air passageways of the brake housing andbrake body and exhausted outwardly through the air passageways of thedisc journal thereby cooling the brake unit.

In the drawings forming part of this application:

FIG. 1 is a longitudinal sectional view on the line 11 of FIG. 1a of aclutch-brake embodying the invention.

FIG. la is an end elevational view of the output end of the device.

FIG. 2 is a sectional view on the line 2-2 of FIG. 1.

FIG; 3 is a sectional view on the line 33 of FIG. 1.

FIG. 4 is a view on the line 44 of FIG. 5 in reduced size.

FIG. 5 is a sectional view on the line 55 of FIG. 4 in reduced size.

FIG. 6 is a view on the line 66 of FIG. 7.

FIG. 7 is a sectional view on the line 77 of FIG. 6.

FIG. 8 is a sectional view on the line 88 of FIG. 7.

FIG. 9 is a perspective view of the disc journal and hub together withthe bearings mounted thereon shown removed from the device.

FIG. 10 is a perspective view of the brake unit shown removed from theclutch unit.

FIG. 11 is a perspective view of the annular piston base and piston aportion of which has been broken away.

FIG. 12 is a perspective view of the annular piston base and piston.

FIG. 13 is a perspective view of the annular piston base and piston asshown in FIG. 12 but rotated 180.

Referring to the drawings in detail, the clutch-brake A includes on theclutch portion C a first hollow hub which has a key slot formed on theinner surface for keying the hub to a motor shaft 22 by means of key 24.The hub 20 also has The disc body 34 has formed therein the spaced airpassages 38 and inwardly thereof the annular recess 40 including theannular shoulder 42. The numeral 44 designates an annular springretainer formed with the annular flange portion 46 which hassubstantially the radial extent of the recms 40. Mounted on the hub 20is the conventional ring retainer 48 which limits the outward slidingmovement of the base portion 30 of the friction disc 28 on the hub. Theretainer 44 is securely pinned to the hub by means of a pin 50.Positioned on the splines 26 of the hub 20 is the coil spring 52 betweenthe shoulder 42 of the disc 28 and the flange 46 of the retainer 44thereby normally urging the friction disc 28 out of engagement with thefriction facing ring 54 of the disc journal 56 hereinafter described aspart of the brake unit B. The ring 54 has the central axial opening 55.The disc journal 56 performs a dual purpose of clutching in the outputshaft and also braking the output shaft 138 as will be hereinafterpointed out.

The numeral 58 designates an annular piston which includes the annularflange 60 concentric with and spaced from the base 30 of disc 28.Extending radially outwardly from the flange 60 is the piston top wall62 which terminates in the annular wall 64 in which is formed theannular recess 66 with the annular shoulder 68 and the annular recess70. A bearing 72 is press fit upon the recess 66 and the cylindricalbase portion 30 of the friction disc 28 with the bearing abutting theannular shoulder 68, the ring retainer 74 in the recess 70, the ringretainer 76 in the annular recess 78 formed in base portion 30, and thebearing is also in abutment with annular shoulder 32. Thus the annularpiston member 58 is mounted on the friction disc 28 by means of thebearing 72 and allows relative rotation therebetween.

The annular wall 64 has formed on the outer surface thereof the annularrecess 80 in which is mounted the O-ring 82 and makes sliding sealingcontact with the cylindrical surface 84 of the annular flange 86 whichextends axially from the annular housing chamber 88. The housing chamber88 also includes the annular flange 90 in which is formed the annularrecess 92 in which is positioned the O-ring 94 which makes slidingsealing contact with the outer annular surface of the annular flange 60which is slidable upon the flange 90. The housing chamber 88 is securedto a motor not shown, by means of spaced bolts 89. The housing 88 isalso formed with the circular recess 91 which receives a mounting rabbetformed on the motor. The flanges 90 and 86 act as cylinder walls onwhich the piston 58 slides, the O-rings 82 and 94 providing a sealingcontact. v

The housing chamber 88 has formed therein the air passageway 96 whichleads to the chamber 98 at the top wall 62 of the piston member 58. Asfluid pressure is admitted to chamber 98 from a source not shown piston58 is moved axially with bearing 72 and friction disc 28 slidable uponhub 20 whereby disc body 34 may be brought into engagement with thefriction facing 54 of disc journal 56 thereby rotating the disc journal56. The disc 28 rotates at all times during the use of the device, forit is positively connected to the motor shaft 22.

The housing 88 further includes the annular wall 100 spaced from andconnected to the annular wall 102 by means of spaced web formation 104and the annular wall 100 is formed with the concentric flange 106. Thewebs 104 define voids 105 as air passageways therebetween. The numeral108 designates a first stationary annular rim formed with the annularrecess 110 into which the flange 106 fits with the wall 100 of the rim108 in abutment and held in abutment by a multiplicity of cap screws111, FIG. 7, in engagement with the tapped holes 112 of the webs 104.The screws 111 extend through holes formed in the first annular rim 108.Between the webs 1 14 and the rims 108 and 1 16 all part of brake unit Band shown in FIG. 3 are the voids 118. Secured in rim 116 and extendingthrough and from the rim 108 are the spaced spring guide pins 120.

The disc journal 56 as part of the brake unit B includes the disc body122 to which the friction ring 54 is secured, and extending from thebody 122 are the spaced and radially extending web-like cooling fins124. The disc body is also formed with the friction surface 123. Thebody 122 is also formed with spaced air passages 126 which aresubstantially in alignment with the passages 38 of disc body 34. Thedisc journal 56 also includes a central and second hub portion 128formed with the recess 130 into which is fit the outer race of thebearing 132 with the inner race thereof fit onto the end portion 134 ofthe retainer 44. Extending from the central hub portion 128 and as partthereof is the hollow cylindrical hub extension 136 which has extendingfrom the outer end thereof the shaft 138 which is the output end of thedevice A. The shaft 138 may be connected to a gear reducer as an exampleof use of the device A whereby the reducer may be stopped and started.

Also included in the brake unit B is the stationary housing portion 140which extends radially inwardly from and includes rim 116. The housingportion 140 is formed with the annular cylinder 142 and the air inletpassage 144. The housing portion 140 has extending inwardly therefromand as part thereof the cylindrical flange 146 with the radially annularinturned lip 148. The housing 140 and flange portion 146 thereof ismounted on the hub extension 136 by means of the bearing 150 and thebearing 152 which allows relative rotation between the housing and thehub extension 136. The hub extension 136 is formed with the hollowrecess 137.

The numeral 154 designates an annular piston base and extending axiallytherefrom is the annular piston 156 which is slidably positioned in theannular cylinder 142. The piston 156 has formed therein the innerannular groove 156a in which is positioned the O-ring 15611. The piston156 is also formed with the annular outer groove 156a in which ispositioned the O- ring 156a, particularly FIG. 1.

The piston base 154 includes a rim 155 as part thereof from whichaxially extends spaced webs 157 which in turn form voids 159 which actas air passageways between the webs 157. The outer ends of webs 157mount the annular piston 156, and the outer face 157a of the webs 157abut the inner face of rim 116 as at Y, particularly FIGS. 1 and 7,thereby limiting the travel of the piston 156 so that a void as at Z ismaintained between the piston and the top of the cylinder 142 so thatthere is not bottoming out of the piston. Secured to the inner face 158of this annular piston base 154 is the friction ring 1590. Also providedare a multiplicity of radially extending spaced eye bolts 160 mounted ina hole 155b formed in a raised portion 155a of rim 155 the inner end 162of which is secured in the piston base 154. The guide pins 120 extendthrough the eye of each of the eye bolts 160, and on each pin 120 is acoil spring 1620 interposed between the eye of each eye bolt 160 and thefirst annular rim 108 whereby the annular piston 156 is normally urgedinto the annular cylinder 142 through the eye bolts 160 of the pistonbase 154 thereby holding disc 159 out of contact with disc journal 122.

The piston 156 and base 154 thereof is moved to cause braking contact offriction ring 159a with disc body 122 to thereby brake shaft 138 bymeans of fluid pressure entering passage 144 into cylinder 142 and uponpiston 156.

With all of the various parts of the brake unit B assembled there isformed the annular air passageway 163 which communicates with the spacedair passages 126.

Further provided are the spaced torque pins 170, particularly FIGS. 6,7, and 8. The outer ends of the pins 170 are anchored in the housing 140and inwardly through loose fit holes 172 of the webs 157 allowing axialmovement of the piston base 154 and the piston 156 thereon. The pins 170also prevent the piston 156 and its base 154 from having relativerotation with respect to housing 140, the housing 140 being stationary.

The tapped holes 174 are formed in the webs 1 14 for receiving mountingscrews of a device used with unit A.

As will be noted, particularly from FIGS. and 7, the clutch unit ormodule C is connected with the brake unit or module B for coactiontherewith by means of the cap screws 111 in engagement with the tapedholes 112 of the webs 104 with the bearing 132 fit into the recess 130of the second hub portion 128. The clutch module C may be usedindependently by removing the brake piston 156 and its base portion 154from the unit, and with such removal the hub 136 and the output shaft138 thereon may be clutched in or out by the Unit C.

The brake unit or module B may be used independently by removing theclutch unit C and bolting the rim 108 of the brake unit to a mountingplate of a motor, not shown, with the shaft 22 of the motor keyed intothe recess 137 of the hub 136. By application of fluid pressure to thebrake piston 156, the friction ring 159 engages the friction surface 123of disc journal 122 thereby braking the shaft 138. it is thus apparentthat the construction of either unit C or B is not dependent upon theconstruction of the other unit, whereby each unit may be used separatelyand that both units together produce a device for selectively andalternately clutching and braking the output shaft.

OPERATION In use of the device fluid pressure is introduced into passage96 whereby piston 58 is moved axially which causes the body portion 34of friction disc 28 to engage the friction ring 54 of disc journal 56thereby driving the shaft 138. The shaft 138 may be braked bydeclutching the unit C by exhausting fluid pressure from passageway 96by conventional valving not shown. Substantially simultaneously with theexhaust of passageway 96 fluid pressure is introduced into passageway144 whereby friction ring 159a is brought into contact with disc body122 which brakes the shaft 138.

In the operation of the device the fins 36 of the friction disc 28 arecontinually rotating during clutching or braking thus drawing air inhorseshoe fashion downwardly through voids or passageways and backupwardly about the fins 36 as indicated by the broken line 107 inFIG. 1. The above mentioned flow of air takes place at all times duringclutching, braking or when there is not clutching or braking.

At the same time air is drawn in through voids or air passageways 118onward into voids or air passageways 159, particularly FIG. 7, in pistonbase 154 and thence through annular cavity 161, particularly FIG. 8, toannular cavity 163 from where it travels to and through spacedpassageways 126. The air further travels through the central opening 55of friction ring 54 and thence through the passages 38 of friction disc28. The air then exits out along the fins 36 where it joins the air flowindicated by the broken line 107 previously described. The abovedescribed flow is indicated by broken line 109. This flow continuouslycools the brake parts.

When the disc journal 122 is static such as in braking, there is atributary flow of air shown in broken line 113 down through voids 118 inthe brake housing and further through the space between the fins 124where it joins the air flow shown in broken lines as 109 in the cavity126, particularly FIGS. 1 and 3.

When the disc journal 122 is rotating then the fins 124 of the disc 122draw and pump air from the air flow line 109 from the area of annularpassageway 163 and outwardly between and past the fins 124. I

It is understood that suitable modifications may be made in thestructure as disclosed.

Having now therefore fully illustrated and described my invention, whatis claimed as new and desired to be protected by Letters Patent is:

1. A combination clutch-brake comprising:

a. a clutch unit including a clutch housing having spaced arcuate voidsas air passageways formed in the outer portion thereof,

b. a first hub having means for connection with a shaft of a primemover,

c. an annular clutch piston slidably mounted on said first hub,

d. an annular clutch cylinder formed on said housing and in which saidclutch piston axially reciprocates,

a friction disc having radially extended cooling fins thereon andslidably mounted on and rotatable with said first hub said fins adjacentsaid arcuate spaced voids,

f. a brake unit including a disc journal mounted on,

m. an annular piston base having an annular brake piston thereon andslidable within said annular brake cylinder,

said annular brake piston base having a friction facing thereon in axialalignment with said disc journal,

means for normally urging said annular brake piston base with saidfriction facing thereon out of engagement with said disc journal,

. means for causing fluid pressure to urge said clutch piston againstsaid friction disc to cause said second hub to rotate,

. means for causing fluid pressure to urge said brake piston againstsaid disc journal to brake said second hub,

. said friction disc being formed with air passageways extending axiallytherethrough and radially spaced from said first hub,

. said disc journal being formed with air passageways extending axiallyand radially therethrough and communicating with said air passageways ofsaid friction disc,

. said brake piston base being formed with annular air passagewaysextending axially therethrough and radially spaced from said second huband communicating with said air passageways of said disc journal, therotation of said friction disc causing a flow of air into and out of theair passageways of said clutch housing and friction disc which draws asecond flow of air inwardly through the air passageways of the discjournal and a third flow of air inwardly through the air passageways ofsaid brake housing and brake body, said second and third air flowsjoining said first air flow for exodus out of the clutch housing therebycooling the brake unit when the disc journal is braked and not brakedand alternatively when the friction disc is in engagement with the discjournal and rotating the disc journal air is drawn radially inwardlythrough the air passageways of said brake housing and brake body and isexhausted outwardly through the air passageways of said disc journalthereby cooling the brake unit,

. said means for normally urging said friction disc out of engagementwith said disc journal including a coil spring mounted concentrically onsaid first hub in abutment at one end with said friction disc and inabutment at the other end with a shoulder carried by said first hub,

w. said means for normally urging said annular brake piston amultiplicity of eye bolts mounted on said annular piston base extendingradially therefrom and through which said guide pins extend, and

a coil spring mounted on at least one of said guide pins between saidrim and the eye of said eye bolt.

The device of claim 1 in which said brake housing mounts a multiplicityof torque pins extended freely through b. holes in said webs allowingaxial movement of said piston base and said piston thereon andpreventing rotation of said brake piston within said brake cylinder.

3. A combination clutch-brake comprising: a. a clutch unit including aclutch housing having spaced arcuate voids as air passageways formed inthe outer portion thereof,

b. a first hub having means for connection with a shaft of a primemover,

c. an annular clutch piston slidably mounted on said first hub,

d. an annular clutch cylinder formed on said housing and in which saidclutch piston axially reciprocates,

e. a friction disc having radially extended cooling fins thereon andslidably mounted on and rotatable with said first hub said fins adjacentsaid arcuate spaced voids,

f. a brake unit including a disc journal mounted on, g. a second hub, h.means rotatably mounting said second hub axially on said i. meansnormally urging said friction disc out of engagement with said discjournal,

a brake housing having spaced arcuate voids as air passageways formed inthe outer portion thereof and mounted on said second hub,

k. means separably connecting said clutch housing with said brakehousing,

1. said brake housing having an annular brake cylinder formed therein,

m. an annular piston base having an annular brake piston thereon andslidable within said annular brake cylinder,

11. said annular brake piston base having a friction facing thereon inaxial alignment with said disc journal,

0. means for normally urging said annular brake piston base with saidfriction facing thereon out of engagement with said disc journal,

p. means for causing fluid pressure to urge said clutch piston againstsaid friction disc to cause said second hub to rotate,

q. means for causing fluid pressure to urge said brake piston amultiplicity of spring guide pins connected to said rim and extendingthrough said air passageways of said brake housing,

. a multiplicity of eye bolts mounted on said annular piston baseextending radially therefrom and through which said guide pins extend,and

u. a coil spring mounted on at least one of said guide pins between saidrim and the eye of said eye bolt. A combination clutch-brake comprising:

a clutch unit including a clutch housing having spaced arcuate voids asair passageways formed in the outer portion thereof,

b. a first hub having means for connection with a shaft of a primemover,

c. an annular clutch piston slidably mounted on said first hub,

d. an annular clutch cylinder formed on said housing and in which saidclutch piston axially reciprocates,

e. a friction disc having radially extended cooling fins thereon andslidably mounted on and rotatable with said first hub said fins adjacentsaid arcuate spaced voids, a brake unit including a disc journal mountedon,

' g. a second hub,

h. means rotatably mounting said second hub axially on said meansnormally urging said friction disc out of engagement with said discjournal,

j. a brake housing having spaced arcuate voids as air passageways formedin the outer portion thereof and mounted on said second hub,

k. means separably connecting said clutch housing with said brakehousing,

l. said brake housing having an annular brake cylinder formed therein,

in. an annular piston base having an annular brake piston thereon andslidable within said annular brake cylinder,

n. said annular brake piston base having afriction facing thereon inaxial alignment with said disc journal,

0. means for normally urging said annular brake piston base with saidfriction facing thereon out of engagement with said disc journal,

p. means for causing fluid pressure to urge said clutch piston againstsaid friction disc to cause said second hub to rotate,

q. means for causing fluid pressure to urge said brake piston againstsaid disc journal to brake said second hub,

. said means connecting said clutch housing with said brake housingbeing separable and including a bearing mounted on said first hub,

. said second hub being formed with a recess in which said bearing ismounted, whereby the brake housing and the components thereof may beseparated from the clutch housing and operated separately or together.

. A combination clutch-brake comprising:

a. a clutch unit including a clutch housing having spaced arcuate voidsas air passageways formed in the outer portion thereof,

b. a first hub having means for connection with a shaft of a primemover,

c. an annular clutch piston slidably mounted on said first hub,

d. an annular clutch cylinder formed on said housing and in which saidclutch piston axially reciprocates,

e. a friction disc having radially extended cooling fins thereon andslidably mounted on and rotatable with said first hub said fins adjacentsaid arcuate spaced voids,

f. a brake unit including a disc journal mounted on,

g. a second hub,

h. means rotatably mounting said second hub axially on said first hub,

i. means normally urging said friction disc out of engagement with saiddisc journal,

j. a brake housing having spaced arcuate voids as air passageways formedin the outer portion thereof and mounted on said second hub,

k. means separably connecting said clutch housing with said brakehousing,

. said brake housing having an annular brake cylinder formed therein,

m. an annular piston base having an annular brake piston thereon andslidable within said annular brake cylinder,

n. said annular brake piston base having a friction facing thereon inaxial alignment with said disc journal,

0. means for normally urging said annular brake piston base with saidfriction facing thereon out of engagement with said disc journal, I

p. means for causing fluid pressure to urge said clutch piston againstsaid friction disc to cause said second hub to rotate,

q. means for causing fluid pressure to urge said brake piston againstsaid disc journal to brake said second hub,

r. said friction disc being formed with air passageways extendingaxially therethrough and radially spaced from said first hub,

s. said disc journal being formed with air passageways extending axiallyand radially therethrough and communicating with said air passageways ofsaid friction disc, t. said brake piston base being formed with annularair passageways extending axially therethrough and radially spaced fromsaid second hub and communicating with said air passageways of said discjournal, the rotation of said friction disc causing a flow of air intoand out of the air passageways of said clutch housing and friction discwhich draws a second flow of air inwardly through the air passageways ofthe disc journal and a third flow of air inwardly through the airpassageways of said brake housing and brake body, said second and thirdair flows joining said first air flow for exodus out of the clutchhousing thereby cooling the brake unit when the disc journal is brakedand not braked and alternatively when the friction disc is in engagementwith the disc journal and rotating the disc journal air is drawnradially inwardly through the air passageways of said brake housing andbrake body and is exhausted outwardly through the air passageways ofsaid disc journal thereby cooling the brake unit,

u. said means for normally urging said friction disc out of engagementwith said disc journal including a coil spring mounted concentrically onsaid first hub in abutment at one end with said friction disc and inabutment at the other end with v. a shoulder carried by said first hub,

w. said means connecting said clutch housing with said brake housingbeing separable and including a bearing mounted on said shoulder of saidfirst hub,

x. said second hub formed with a recess in which said bearing is mountedwhereby the brake housing and the components thereof may be separatedfrom the clutch housing and used separately or together.

6. A combination clutch-brake comprising:

a. a clutch unit including a clutch housing having spaced arcuate voidsas air passageways formed in the outer portion thereof,

b. a first hub having means for connection with a shaft of a primemover,

c. an annular clutch piston slidably mounted on said first hub,

d. an annular clutch cylinder formed on said housing and in which saidclutch piston axially reciprocates,

e. a friction disc having radially extended cooling fins thereon andslidably mounted on and rotatable with said first hub said fins adjacentsaid arcuate spaced voids,

a brake unit including a disc journal mounted on,

g. a second hub,

h. means rotatably mounting said second hub axially on said first hub,

. means normally urging said friction disc out of engagement with saiddisc journal,

j. a brake housing having spaced arcuate voids as air passageways formedin the outer portion thereof and mounted on said second hub,

k. means separably connecting said clutch housing with said brakehousing,

. said brake housing having an annular brake cylinder formed therein,

m. an annular piston base having an annular brake piston thereon andslidable within said annular brake cylinder,

n. said annular brake piston base having a friction facing thereon inaxial alignment with said disc journal,

0. means for normally urging said annular brake piston base with saidfriction facing thereon out of engagement with said disc journal,

p. means for causing fluid pressure to urge said clutch piston againstsaid friction disc to cause said second hub to rotate,

q. means for causing fluid pressure to urge said brake piston againstsaid disc journal to brake said second hub,

r. said friction disc being formed with air passageways extendingaxially therethrough and radially spaced from said first hub,

5. said disc journal being formed with air passageways extending axiallyand radially therethrough and communicating with said air passageways ofsaid friction disc,

t. said brake piston base being formed with annular air passagewaysextending axially therethrough and radially spaced from said second huband communicating with said air passageways of said disc journal, therotation of said friction disc causing a flow of air into and out of theair passageways of said clutch housing and friction disc which draws asecond flow of air inwardly through the air passageways of the discjournal and a third flow of air inwardly through the air passageways ofsaid brake housing and brake body, said second and third air flowsjoining said first air flow for exodus out of the clutch housing therebycooling the brake unit when the disc journal is braked and not brakedand alternatively when the friction disc is in engagement with the discjournal and rotating the disc journal air is drawn radially inwardlythrough the air passageways of said brake housing and brake body and isexhausted outwardly through the air passageways of said disc journalthereby cooling the brake unit,

u. said means for normally urging said friction disc out of engagementwith said disc journal including a coil spring mounted concentrically onsaid first hub in abutment at one end with said friction disc and inabutment at the other end with v. a shoulder carried by said first hub,

w. said means for normally urging said annular brake piston with saidfriction facing thereon out of engagement with said disc journalincluding a rim connected by webs to said brake housing,

x. a multiplicity of spring guide pins connected to said rim andextending through said air passageways of said brake housing,

y. a multiplicity of eye bolts mounted on said annular piston baseextending radial therefrom and through which said guide pins extend,

z. a coil spring mounted on at least one of said guide pins between saidrim and the eye of said eye bolt,

aa. said means connecting said clutch housing with said brake housingbeing separable and including a bearing mounted on said shoulder of saidfirst hub,

bb. said second hub formed with a recess in which said bearing ismounted whereby the brake housing and the components thereof may beseparated from the clutch housing and used separately or together.

7. A combination clutch-brake for combined use or use of the clutch orbrake singly comprising:

a. a clutch housing,

b. a first hub mounted in said clutch housing for connection with aprime mover shaft,

c. a clutch disc body slidably mounted on said hub,

d. a brake housing,

e. a second hub mounted in said brake housing,

f. means removably connecting said second hub axially upon said firsthub,

g. a disc journal carried by said second hub,

h. means for slidably moving said clutch disc axially on said first hubinto contact with said disc journal to drive said hub,

i. means for braking said disc journal to brake said second hub, and

j. means removably connecting said clutch housing with said brakehousing simultaneously with the connection of the second hub on thefirst hub.

1. A combination clutch-brake comprising: a. a clutch unit including a clutch housing having spaced arcuate voids as air passageways formed in the outer portion thereof, b. a first hub having means for connection with a shaft of a prime mover, c. an annular clutch piston slidably mounted on said first hub, d. an annular clutch cylinder formed on said housing and in which said clutch piston axially reciprocates, e. a friction disc having radially extended cooling fins thereon and slidably mounted on and rotatable with said first hub said fins adjacent said arcuate spaced voids, f. a brake unit including a disc journal mounted on, g. a second hub, h. means rotatably mounting said second hub axially on said first hub, i. means normally urging said friction disc out of engagement with said disc journal, j. a brake housing having spaced arcuate voids as air passageways formed in the outer portion thereof and mounted on said second hub, k. means separably connecting said clutch housing with said brake housing, l. said brake housing having an annular brake cylinder formed therein, m. an annular piston base having an annular brake piston thereon and slidable within said annular brake cylinder, n. said annular brake piston base having a friction facing thereon in axial alignment with said disc journal, o. means for normally urging said annular brake piston base with said friction facing thereon out of engagement with said disc journal, p. means for causing fluid pressure to urge said clutch piston against said friction disc to cause said second hub to rotate, q. means foR causing fluid pressure to urge said brake piston against said disc journal to brake said second hub, r. said friction disc being formed with air passageways extending axially therethrough and radially spaced from said first hub, s. said disc journal being formed with air passageways extending axially and radially therethrough and communicating with said air passageways of said friction disc, t. said brake piston base being formed with annular air passageways extending axially therethrough and radially spaced from said second hub and communicating with said air passageways of said disc journal, the rotation of said friction disc causing a flow of air into and out of the air passageways of said clutch housing and friction disc which draws a second flow of air inwardly through the air passageways of the disc journal and a third flow of air inwardly through the air passageways of said brake housing and brake body, said second and third air flows joining said first air flow for exodus out of the clutch housing thereby cooling the brake unit when the disc journal is braked and not braked and alternatively when the friction disc is in engagement with the disc journal and rotating the disc journal air is drawn radially inwardly through the air passageways of said brake housing and brake body and is exhausted outwardly through the air passageways of said disc journal thereby cooling the brake unit, u. said means for normally urging said friction disc out of engagement with said disc journal including a coil spring mounted concentrically on said first hub in abutment at one end with said friction disc and in abutment at the other end with v. a shoulder carried by said first hub, w. said means for normally urging said annular brake piston with said friction facing thereon out of engagement with said disc journal including a rim connected by webs to said brake housing, x. a multiplicity of spring guide pins connected to said rim and extending through said air passageways of said brake housing, y. a multiplicity of eye bolts mounted on said annular piston base extending radially therefrom and through which said guide pins extend, and z. a coil spring mounted on at least one of said guide pins between said rim and the eye of said eye bolt.
 2. The device of claim 1 in which a. said brake housing mounts a multiplicity of torque pins extended freely through b. holes in said webs allowing axial movement of said piston base and said piston thereon and preventing rotation of said brake piston within said brake cylinder.
 3. A combination clutch-brake comprising: a. a clutch unit including a clutch housing having spaced arcuate voids as air passageways formed in the outer portion thereof, b. a first hub having means for connection with a shaft of a prime mover, c. an annular clutch piston slidably mounted on said first hub, d. an annular clutch cylinder formed on said housing and in which said clutch piston axially reciprocates, e. a friction disc having radially extended cooling fins thereon and slidably mounted on and rotatable with said first hub said fins adjacent said arcuate spaced voids, f. a brake unit including a disc journal mounted on, g. a second hub, h. means rotatably mounting said second hub axially on said first hub, i. means normally urging said friction disc out of engagement with said disc journal, j. a brake housing having spaced arcuate voids as air passageways formed in the outer portion thereof and mounted on said second hub, k. means separably connecting said clutch housing with said brake housing, l. said brake housing having an annular brake cylinder formed therein, m. an annular piston base having an annular brake piston thereon and slidable within said annular brake cylinder, n. said annular brake piston base having a friction facing thereon in axial alignment with said disc journal, o. means for normally urging said annular bRake piston base with said friction facing thereon out of engagement with said disc journal, p. means for causing fluid pressure to urge said clutch piston against said friction disc to cause said second hub to rotate, q. means for causing fluid pressure to urge said brake piston against said disc journal to brake said second hub, r. said means for normally urging said annular brake piston with said friction facing thereon out of engagement with said disc journal including a rim connected by webs to said second housing, s. a multiplicity of spring guide pins connected to said rim and extending through said air passageways of said brake housing, t. a multiplicity of eye bolts mounted on said annular piston base extending radially therefrom and through which said guide pins extend, and u. a coil spring mounted on at least one of said guide pins between said rim and the eye of said eye bolt.
 4. A combination clutch-brake comprising: a. a clutch unit including a clutch housing having spaced arcuate voids as air passageways formed in the outer portion thereof, b. a first hub having means for connection with a shaft of a prime mover, c. an annular clutch piston slidably mounted on said first hub, d. an annular clutch cylinder formed on said housing and in which said clutch piston axially reciprocates, e. a friction disc having radially extended cooling fins thereon and slidably mounted on and rotatable with said first hub said fins adjacent said arcuate spaced voids, f. a brake unit including a disc journal mounted on, g. a second hub, h. means rotatably mounting said second hub axially on said first hub, i. means normally urging said friction disc out of engagement with said disc journal, j. a brake housing having spaced arcuate voids as air passageways formed in the outer portion thereof and mounted on said second hub, k. means separably connecting said clutch housing with said brake housing, l. said brake housing having an annular brake cylinder formed therein, m. an annular piston base having an annular brake piston thereon and slidable within said annular brake cylinder, n. said annular brake piston base having a friction facing thereon in axial alignment with said disc journal, o. means for normally urging said annular brake piston base with said friction facing thereon out of engagement with said disc journal, p. means for causing fluid pressure to urge said clutch piston against said friction disc to cause said second hub to rotate, q. means for causing fluid pressure to urge said brake piston against said disc journal to brake said second hub, r. said means connecting said clutch housing with said brake housing being separable and including a bearing mounted on said first hub, s. said second hub being formed with a recess in which said bearing is mounted, whereby the brake housing and the components thereof may be separated from the clutch housing and operated separately or together.
 5. A combination clutch-brake comprising: a. a clutch unit including a clutch housing having spaced arcuate voids as air passageways formed in the outer portion thereof, b. a first hub having means for connection with a shaft of a prime mover, c. an annular clutch piston slidably mounted on said first hub, d. an annular clutch cylinder formed on said housing and in which said clutch piston axially reciprocates, e. a friction disc having radially extended cooling fins thereon and slidably mounted on and rotatable with said first hub said fins adjacent said arcuate spaced voids, f. a brake unit including a disc journal mounted on, g. a second hub, h. means rotatably mounting said second hub axially on said first hub, i. means normally urging said friction disc out of engagement with said disc journal, j. a brake housing having spaced arcuate voids as air passageways formed in the outer portion thereof and mounted on Said second hub, k. means separably connecting said clutch housing with said brake housing, l. said brake housing having an annular brake cylinder formed therein, m. an annular piston base having an annular brake piston thereon and slidable within said annular brake cylinder, n. said annular brake piston base having a friction facing thereon in axial alignment with said disc journal, o. means for normally urging said annular brake piston base with said friction facing thereon out of engagement with said disc journal, p. means for causing fluid pressure to urge said clutch piston against said friction disc to cause said second hub to rotate, q. means for causing fluid pressure to urge said brake piston against said disc journal to brake said second hub, r. said friction disc being formed with air passageways extending axially therethrough and radially spaced from said first hub, s. said disc journal being formed with air passageways extending axially and radially therethrough and communicating with said air passageways of said friction disc, t. said brake piston base being formed with annular air passageways extending axially therethrough and radially spaced from said second hub and communicating with said air passageways of said disc journal, the rotation of said friction disc causing a flow of air into and out of the air passageways of said clutch housing and friction disc which draws a second flow of air inwardly through the air passageways of the disc journal and a third flow of air inwardly through the air passageways of said brake housing and brake body, said second and third air flows joining said first air flow for exodus out of the clutch housing thereby cooling the brake unit when the disc journal is braked and not braked and alternatively when the friction disc is in engagement with the disc journal and rotating the disc journal air is drawn radially inwardly through the air passageways of said brake housing and brake body and is exhausted outwardly through the air passageways of said disc journal thereby cooling the brake unit, u. said means for normally urging said friction disc out of engagement with said disc journal including a coil spring mounted concentrically on said first hub in abutment at one end with said friction disc and in abutment at the other end with v. a shoulder carried by said first hub, w. said means connecting said clutch housing with said brake housing being separable and including a bearing mounted on said shoulder of said first hub, x. said second hub formed with a recess in which said bearing is mounted whereby the brake housing and the components thereof may be separated from the clutch housing and used separately or together.
 6. A combination clutch-brake comprising: a. a clutch unit including a clutch housing having spaced arcuate voids as air passageways formed in the outer portion thereof, b. a first hub having means for connection with a shaft of a prime mover, c. an annular clutch piston slidably mounted on said first hub, d. an annular clutch cylinder formed on said housing and in which said clutch piston axially reciprocates, e. a friction disc having radially extended cooling fins thereon and slidably mounted on and rotatable with said first hub said fins adjacent said arcuate spaced voids, f. a brake unit including a disc journal mounted on, g. a second hub, h. means rotatably mounting said second hub axially on said first hub, i. means normally urging said friction disc out of engagement with said disc journal, j. a brake housing having spaced arcuate voids as air passageways formed in the outer portion thereof and mounted on said second hub, k. means separably connecting said clutch housing with said brake housing, l. said brake housing having an annular brake cylinder formed therein, m. an annular piston base having an annular brake piston thereon and slidable within said annular brake cylInder, n. said annular brake piston base having a friction facing thereon in axial alignment with said disc journal, o. means for normally urging said annular brake piston base with said friction facing thereon out of engagement with said disc journal, p. means for causing fluid pressure to urge said clutch piston against said friction disc to cause said second hub to rotate, q. means for causing fluid pressure to urge said brake piston against said disc journal to brake said second hub, r. said friction disc being formed with air passageways extending axially therethrough and radially spaced from said first hub, s. said disc journal being formed with air passageways extending axially and radially therethrough and communicating with said air passageways of said friction disc, t. said brake piston base being formed with annular air passageways extending axially therethrough and radially spaced from said second hub and communicating with said air passageways of said disc journal, the rotation of said friction disc causing a flow of air into and out of the air passageways of said clutch housing and friction disc which draws a second flow of air inwardly through the air passageways of the disc journal and a third flow of air inwardly through the air passageways of said brake housing and brake body, said second and third air flows joining said first air flow for exodus out of the clutch housing thereby cooling the brake unit when the disc journal is braked and not braked and alternatively when the friction disc is in engagement with the disc journal and rotating the disc journal air is drawn radially inwardly through the air passageways of said brake housing and brake body and is exhausted outwardly through the air passageways of said disc journal thereby cooling the brake unit, u. said means for normally urging said friction disc out of engagement with said disc journal including a coil spring mounted concentrically on said first hub in abutment at one end with said friction disc and in abutment at the other end with v. a shoulder carried by said first hub, w. said means for normally urging said annular brake piston with said friction facing thereon out of engagement with said disc journal including a rim connected by webs to said brake housing, x. a multiplicity of spring guide pins connected to said rim and extending through said air passageways of said brake housing, y. a multiplicity of eye bolts mounted on said annular piston base extending radial therefrom and through which said guide pins extend, z. a coil spring mounted on at least one of said guide pins between said rim and the eye of said eye bolt, aa. said means connecting said clutch housing with said brake housing being separable and including a bearing mounted on said shoulder of said first hub, bb. said second hub formed with a recess in which said bearing is mounted whereby the brake housing and the components thereof may be separated from the clutch housing and used separately or together.
 7. A combination clutch-brake for combined use or use of the clutch or brake singly comprising: a. a clutch housing, b. a first hub mounted in said clutch housing for connection with a prime mover shaft, c. a clutch disc body slidably mounted on said hub, d. a brake housing, e. a second hub mounted in said brake housing, f. means removably connecting said second hub axially upon said first hub, g. a disc journal carried by said second hub, h. means for slidably moving said clutch disc axially on said first hub into contact with said disc journal to drive said hub, i. means for braking said disc journal to brake said second hub, and j. means removably connecting said clutch housing with said brake housing simultaneously with the connection of the second hub on the first hub. 